EP 2161833 A1 20100310 - Gain switching circuit for preamplifier
Title (en)
Gain switching circuit for preamplifier
Title (de)
Verstärkungsschaltkreis für Vorverstärker
Title (fr)
Circuit de commutation de gain pour préamplificateur
Publication
Application
Previously filed application
PCT/JP03/09682 20030730 WO
Priority
- EP 03817770 A 20030730
- JP 0309682 W 20030730
Abstract (en)
A gain switching circuit (3) that switches a conversion gain of a preamp (2) , which outputs a voltage signal upon amplifying an output current of a photo-detecting element (1) that converts a burst-form optical signal into an electrical signal and with which a series circuit, formed with a first resistor (6) and a first switching element (9) , and a series circuit, formed with a second resistor (7) and a second switching element (10) are connected in parallel to a feedback resistor (2B). The switching circuit further includes a gate signal generating circuit that generates, upon receiving an output of the pre-amplifier, a gate signal for a first and second operating unit.
IPC 8 full level
H03G 3/30 (2006.01); H03F 3/08 (2006.01); H03G 1/00 (2006.01)
CPC (source: EP US)
H03F 3/08 (2013.01 - EP US); H03G 1/0047 (2013.01 - EP US); H03G 3/3084 (2013.01 - EP US); H04B 10/69 (2013.01 - EP US); H03G 2201/103 (2013.01 - EP US); H03G 2201/502 (2013.01 - EP US)
Citation (search report)
- [XA] JP 2001196877 A 20010719 - MITSUBISHI ELECTRIC CORP
- [XA] JP 2001144552 A 20010525 - NEC CORP
- [X] JP 2000252774 A 20000914 - NEC CORP
- [X] US 6246282 B1 20010612 - OONO HIROSHI [JP], et al
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 2006226913 A1 20061012; US 7598479 B2 20091006; CN 1820413 A 20060816; CN 1820413 B 20121031; DE 60329633 D1 20091119; EP 1653607 A1 20060503; EP 1653607 A4 20080528; EP 1653607 B1 20091007; EP 2161833 A1 20100310; EP 2161833 B1 20111130; JP 4593467 B2 20101208; JP WO2005013480 A1 20060928; WO 2005013480 A1 20050210
DOCDB simple family (application)
US 56624003 A 20030730; CN 03826960 A 20030730; DE 60329633 T 20030730; EP 03817770 A 20030730; EP 09009347 A 20030730; JP 0309682 W 20030730; JP 2005507384 A 20030730